After a two year build and looking at all the reference including the movie, to me the three studs starting on top of the right shoulder are white with the first one having a red top. The one holding the cape is gray in some
of the reference and that's how I did our shoulders. I believe that they had a number of studs on set and mixed and matched them when suiting up at different times.
In the above photo look at the silver pieces on the right gauntlet. They have a different reflective quality than the studs.This ,in my opinion, is not a result of lighting angle
or background values...they are painted. In this scene the three studs are painted white and the top part of the fourth, being not covered buy the cape,is clearly medium to dark gray.
Our Boba passed 501st approval as described.
Photos can be all over the place depending on the exposure when taken and the contrast and color when printed.